MAINTAINERS: add maillist information for LoongArch

Now there is a dedicated maillist ([email protected]) for
LoongArch, add it for better collaboration.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Huacai Chen <[email protected]>
Reviewed-by: WANG Xuerui <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Xuefeng Li <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Xuerui Wang <[email protected]>
Cc: Jiaxun Yang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: chenhuacai

MAINTAINERS

@@ -11591,6 +11591,7 @@ F:	drivers/gpu/drm/bridge/lontium-lt8912b.c
 LOONGARCH
 M:	Huacai Chen <[email protected]>
 R:	WANG Xuerui <[email protected]>
+L:	[email protected]
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git
 F:	arch/loongarch/